Aspirin Lab C4H6O3 + C7H6O3 --> C9H8O4 +C2H4O2 5.00 ml of acetic anhydride (density = 1.08 g/ml) and 2.08 g of salicylic acid. The student collects 2.01 g of aspirin. Find the limiting reactant, theoretical yield, and the percent yield. C4H6O3 = acetic anhydride C7H6O3 = salicylic acid C9H8O4 = aspirin C2H4O2= acetic acid.